/**
 * Created by c426117 on 18-5-5.
 * js extend
 */



/**
 * 判断obj是否为空
 * @returns {boolean}
 */
isEmpty = function(obj){
    for (var prop in obj) {
        if (obj.hasOwnProperty(prop)) return false;
    }
    return true;
};

/**
 * 深拷贝obj
 * @returns {obj}
 */
clone = function(obj) {
    // Handle the 3 simple types, and null or undefined
    if (null == obj || "object" != typeof obj) return obj;

    // Handle Date
    if (obj instanceof Date) {
        var copy = new Date();
        copy.setTime(obj.getTime());
        return copy;
    }

    // Handle Array
    if (obj instanceof Array) {
        var copy = [];
        for (var i = 0,len = obj.length; i < len; ++i) {
            copy[i] = clone(obj[i]);
        }
        return copy;
    }

    // Handle Object
    if (obj instanceof Object) {
        var copy = {};
        for (var attr in obj) {
            if (obj.hasOwnProperty(attr)) copy[attr] = clone(obj[attr]);
        }
        return copy;
    }

    throw new Error("Unable to copy obj! Its type isn't supported.");
};

/**
 * md5生成
 * @returns {string}
 */
let mi = require('crypto');
let md5 = mi.createHash('md5');
function makeMd5(buffer) {
    return md5.update(buffer).digest('hex');
}
